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"Specialist officers and the Royal Navy have attended and confirmed the nature of the device.

"The operation to remove the ordnance is ongoing in partnership with our colleagues in the Royal Navy."

In an updated statement this morning it warned that road cordons could cause disruption on the roads, and urged drivers to find alternative routes.

A spokesperson added: "The operation to remove the ordnance is ongoing in partnership with our colleagues in the Royal Navy.

"While we endeavour to progess the operation as quickly as possible and minimise disruption, it is important that all of the necessary steps and precautions are taken to ensure it is dealt with safely.

"We would like to thank everyone affected for their patience and cooperation."

London City Airport is the 14th busiest in the UK with 4,540,000 passengers in 2017, according to data from the Civil Aviation Authority.